本文選題：匹配定位 + 雙差定位��； 參考：《地震地質(zhì)》2017年04期

【摘要】：采用新發(fā)展的匹配定位(ML)方法檢測(cè)與定位2014年2月28日寧夏石嘴山M_L4.4震群地震目錄中遺漏的微小地震事件,共檢測(cè)定位34次地震,是寧夏臺(tái)網(wǎng)定位地震數(shù)目(13次)的近3倍;地震數(shù)明顯增多,地震目錄完整性明顯改善,為更科學(xué)合理地研究震群活動(dòng)過程和發(fā)震構(gòu)造提供了可能。利用CAP方法反演得到的主震最佳雙力偶解為節(jié)面Ⅰ:走向354°,傾角70°,滑動(dòng)角166°;節(jié)面Ⅱ:走向89°,傾角77°,滑動(dòng)角21°;矩震級(jí)為M_W3.9;震源以走滑錯(cuò)動(dòng)為主帶有少量逆沖分量。結(jié)合主震雙差定位結(jié)果和震源機(jī)制最佳擬合深度,認(rèn)為主震深度為7~8km,屬于淺源地震。結(jié)合銀川盆地深地震三維成像研究成果,認(rèn)為主震及最大余震發(fā)生于上地殼內(nèi)的可能性較大,其余地震則主要發(fā)生于沉積層底部或者是上地殼結(jié)晶基底的頂部。震群活動(dòng)時(shí)空演化圖像顯示,震群整體分布呈現(xiàn)近SN向展布,余震主要集中于主震以北區(qū)域,并呈現(xiàn)較明顯的由南向北逐步延伸的態(tài)勢(shì),隨著余震向北發(fā)展震源由深部向淺部遷移。地震深度剖面投影圖像及主震震源機(jī)制解結(jié)果均顯示發(fā)震斷層E傾,傾角較大,表明石嘴山震群發(fā)生于賀蘭山東麓斷裂的可能性較大。地震地表投影圖像顯示震中分布延展至賀蘭山東麓斷裂北端終止點(diǎn)以北,由此推測(cè)賀蘭山東麓斷裂存在繼續(xù)向北延伸的可能。
[Abstract]:In this paper, the newly developed matching locator (MLL) method is used to detect and locate the minor earthquake events missing from the M_L4.4 earthquake catalogue of Shizuishan, Ningxia on February 28, 2014. A total of 34 earthquakes are detected and located, which is nearly 3 times as many as 13 earthquakes located in Ningxia network. The number of earthquakes increases obviously and the integrity of earthquake catalogue is improved obviously, which provides the possibility for more scientific and reasonable study on the process of earthquake swarm activity and seismogenic structure. The optimum double couple solutions of the main shock obtained by CAP method are as follows: strike I: strike 354 擄, inclination 70 擄, slip angle 166 擄; Nodal 鈪，

本文編號(hào)：1902635